Normally, I would not blog product promotions but this keyword research tool is (1) incredibly powerful and (2) very affordable. The press release is available and pdf with the features.

The three major components of the product at:
(1) Search Term Suggestions - provides the most popular search term variations for any word
(2) Industry Search Terms - provides the most popular search terms for over 160 industries
(3) Search Term Portfolios - an easy to use tool to manage keyword lists

Basically, this is a lower end version of Hitwise's master products. It is an affordable, but rich data set of information which you can use for your clients. The data is superior to other keyword research tools because they can tell you two more important things than other products (might be more then two):

(1) The "Success Rate" which is basically the click through rate from the SERPs to the page. You can use this data to not only see which search terms are most popular, but which drive a larger number of clicks.

(2) "Industry Search Tool" provides a method for you to search for the most popular search terms within an industry. An excellent started for brainstorming.

The Portfolio is a great way to organize all this data and build personalized reports with "Volume" and "Success Rate" marks. Not only this, but you can compare different markets (US, UK, Australia, and so on). Very powerful and worth taking a look at.